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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67419bbf2e1ccd8df8183b0bd13e424166564c3b4e2f71cd4430ee914fe2b3b2' 
  AND token = 'ZaLy3C0MGCNlMG9OmYyZDIqacgtFxncR+nvobE33Fa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}